Run integration tests in 'machine' type on CircleCI

Need to move the 'images' directory to /tmp since /go isn't writeable
in 'machine' executor type on CircleCI.  Indirect via symlink so we
can run the Makefile unchanged from the project directory.

The Postgres container we were running seems to have been ignored,
since the Makefile always runs another one.

Signed-off-by: Bryan Boreham <[email protected]>

Author: bboreham

.circleci/config.yml

@@ -77,25 +77,22 @@ jobs:
         command: make BUILD_IN_CONTAINER=false test
 
   integration:
-    docker:
-    - image: cortexproject/build-image:master-561033f49
-    - image: circleci/postgres:9.6.2-alpine
-      environment:
-        POSTGRES_DB: configs_test
+    machine:
+      image: ubuntu-1604:201903-01
 
-    working_directory: /go/src/github.com/cortexproject/cortex
+    working_directory: ~/src/github.com/cortexproject/cortex
     steps:
     - checkout
-    - setup_remote_docker
-    - install-docker
     - restore_cache:
         key: v1-cortex-{{ .Branch }}-{{ .Revision }}
     - run:
         name: Integration Test
-        command: MIGRATIONS_DIR=$(pwd)/cmd/cortex/migrations make BUILD_IN_CONTAINER=false configs-integration-test
+        command: |
+          touch build-image/.uptodate
+          MIGRATIONS_DIR=$(pwd)/cmd/cortex/migrations make BUILD_IMAGE=cortexproject/build-image:1370-pin-protoc-7ae297930 configs-integration-test
     - run:
         name: Load Images
-        command: make BUILD_IN_CONTAINER=false load-images
+        command: ln -s /tmp/images ./images; make BUILD_IN_CONTAINER=false load-images
     - run:
         name: Ingester hand-over test
         command: ./integration-tests/test-handover.sh
@@ -124,12 +121,15 @@ jobs:
 
     - run:
         name: Save Images
-        command: make BUILD_IN_CONTAINER=false save-images
+        command: |
+          mkdir /tmp/images
+          ln -s /tmp/images ./images
+          make BUILD_IN_CONTAINER=false save-images
 
     - save_cache:
         key: v1-cortex-{{ .Branch }}-{{ .Revision }}
         paths:
-        - images/
+        - /tmp/images/
 
   deploy:
     <<: *defaults
@@ -143,7 +143,7 @@ jobs:
 
     - run:
         name: Load Images
-        command: make BUILD_IN_CONTAINER=false load-images
+        command: ln -s /tmp/images ./images; make BUILD_IN_CONTAINER=false load-images
 
     - run:
         name: Deploy